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The Journal of Immunology, Vol 141, Issue 8 2771-2780, Copyright © 1988 by American Association of Immunologists
ARTICLES |
KA Gollahon, J Hagman, RL Brinster and U Storb
Department of Molecular Genetics and Cell Biology, University of Chicago, IL 60637.
In order to study the regulation of expression of Ig lambda genes we have analyzed lambda-producing hybridomas derived from transgenic mice which harbor a functionally rearranged kappa transgene. We also analyzed lambda-producing hybridomas from nontransgenic mice. Surprisingly, all but one of the transgenic lambda-hybridomas co- produce kappa L chains. Also, in contrast to transgenic kappa- hybridomas, most lambda-hybridomas have rearranged endogenous kappa genes despite the presence of transgenic kappa-chains and endogenous H chains. Analysis of spleen cells and hybridomas from nontransgenic mice shows that about 20% of lambda-producing B cells in the spleen co- produce kappa, and a similar proportion of lambda-hybridomas from normal spleens produce both kappa- and lambda-chains. The data argue strongly against the strictly sequential expression of kappa and lambda genes. We present a new model for the regulation of kappa and lambda gene expression, whose key feature is the distinction between a kappa cell lineage in which Ig gene rearrangement is susceptible to feedback by a complete antibody molecule at the pre-B cell stage, and a kappa lambda B cell lineage which does not show feedback inhibition during B cell development.
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